Java中常用的类型转换汇总

1.Integer转换成int的方法

Integer i = new Integer(10);

int k = i.intValue();

即Integer.intValue();

2.int转换成Integer

int i = 10;

Integer it = new Integer(i);

3.String转换成int的方法

String str ="10"; 

Integer it = newInterger(str); 

int i = it.intValue(); 

即：int i = Integer.intValue(string);

4.int转换成String

int i = 10;

(1)String s =String.valueOf(i);

(2)String s =Ingeger.toString(i);

(3)String s = "" +i;

5.String转换成Integer

String str = "10";

Integer it =Integer.valueOf(str);

6.Integer转换成String

Integer it = new Integer(10);

String str = it.toString();

7.String转换成BigDecimal

BigDecimal bd = newBigDecimal(str);

8.日期

Calendar calendar =Calendar.getInstance();

int year =calendar.get(Calendar.YEAR);

int month =calendar.get(Calendar.MONTH)+1;

int day =calendar.get(Calendar.DATE);

//获取今天的日期字符串

String today =java.text.DateFormat.getDateInstance().format(new java.util.Date());

//获取今天的日期

new java.sql.Date(System.currentTimeMillis());

9.字符数组与字符串之间的转换